Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
  • H01F1/15391—Elongated structures, e.g. wires
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
  • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
  • H01F1/15383—Applying coatings thereon
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]

Definitions

• the invention refers to amo ⁇ hous and nanocrystalline magnetic glass-covered
• amo ⁇ hous magnetic wires with diameters ranging from 60 ⁇ m 180 ⁇ m are obtained by the in-rotating- water spinning method and nanocrystalline magnetic wires are obtained by controlled thermal treatments of the above mentioned amorphous ones with adequate compositions
• the disadvantage of these wires consists in the fact that they can not be obtained directly from the melt in amorphous state with diameters less than 60 ⁇ m
• Amorphous magnetic wires having diameters of minimum 30 ⁇ m are obtained by successive cold-drawings of the above mentioned amorphous magnetic wires followed by stress relief thermal treatments
• the disadvantage of these wires consists in the fact that by repeated
• the amorphous magnetic wires are characterized in the fact that they consist in an amorphous metallic inner core with diameters ranging between 1 ⁇ m and 50 ⁇ m and a glass cover in the shape of a glass coat with a thickness ranging between 0.5 ⁇ m and 20 ⁇ m, the metallic core having compositions chosen so to allow to obtain wires in amo ⁇ hous state, at cooling rates that can be technically obtained and with adequate magnetic properties for different application categories
• the amo ⁇ hous magnetic wires consists of an amo ⁇ hous metallic inner core of compositions based on transition metals (Fe, Co, and/or Ni) 60 80 atomic %, 40 .
• the amount of the transition metals and metalloids is chosen so to obtain alloys with high saturation magnetization, positive, negative or nearly zero magnetostriction, coercive field and magnetic permeability having adequate values in function of the requested applications.
• the total amount and the number of the additional elements are chosen so to facilitate the amorphism-forming ability
• amorphous magnetic glass-covered wires having high positive magnetostriction, 5 up to 25 ⁇ m diameter of the metallic core and 1 up to 15 ⁇ m thickness of the glass cover, of compositions based on Fe containing 20 atomic % or less Si, 7 up to 35 atomic % B and 25 atomic % or less from one or more metals selected from the group Co, Ni, Cr, Ta, Nb, V, Cu, Al, Mo, Mn, W, Zr, Hf.
• nanocrystalline magnetic glass-covered wires For applications as minitransformers and inductive coils, that implies high values of the saturation magnetization and of the magnetic permeability they are adequate nanocrystalline magnetic glass-covered wires according to the invention with diameters of the metallic core ranging between 5 and 25 ⁇ m and thickness of the glass cover ranging between 1 and 15 ⁇ m of compositions based on Fe containing 20 atomic % or less Si, 7 up to 35 atomic % B and 25 atomic % or less from one or more metals selected from the group Cu, Nb, V, Ta, W, Zr, Hf.
• amo ⁇ hous metallic core with positive or nearly zero magnetostriction or of the nanocrystalline metallic core having nearly zero magnetostriction and the optical properties of the glass cover properties that are related to the optical transmission of the information, they are adequate amo ⁇ hous and nanocrystalline glass-covered wires according to the invention, with diameters of the metallic core ranging between 10 and 20 ⁇ m and thickness of the glass cover ranging between 10 and 20 ⁇ m of compositions based on Fe or Co containing 20 atomic % or less Si, 7 up to 35 atomic % B and 25 atomic % or less from one or more metals selected from the group Ni, Cr, Ta, Nb, V, Cu, Al, Mo, Mn, W, Zr, Hf.
• the process of producing amo ⁇ hous magnetic glass-covered wires allows to obtain wires with the above mentioned dimensional and compositional characteristics directly by rapid quenching from the melt and consists in melting the metallic alloy which is introduced in a glass tube till the glass becomes soft, drawing the glass tube together with the molten alloy which is stretched to form a glass- coated metallic filament which is coiled on a winding drum ensuring a high cooling rate necessary to obtain the metallic wire in amorphous state in the following conditions
• the glass tube, containing the molten alloy moves down with a uniform feed-in speed ranging between 5 x 10 '6 and 170 * 10 "6 m/s;
• the high purity alloy is prepared in an arc furnace or in an induction furnace using pure components (at least 99% purity) bulk shaped or powders bond together by pressing and than heating in vacuum or inert atmosphere (depending on the reactivity of the employed components),
• the employed glass must be compatible with the metal or the alloy at the drawing temperature in order to avoid the process of glass-metal diffusion.
• the thermal expansion coefficient of the glass must be equal or slightly smaller than that of the employed metal or alloy to avoid the fragmentation of the alloy during the solidification process due to the internal stresses.
• ⁇ ⁇ - they can be used into a large field of applications based on their magnetic properties and behavior, ⁇ ⁇ - they present the switching of the magnetization (large Barkhausen effect) for very short length, down to 1 mm, as compared to the amorphous magnetic wires obtained by the in- rotating-water spinning method that present the switching of the magnetization for lengths of minimum 5-7 cm or to the cold-drawn ones that present this effect for lengths of minimum 3 cm, in this way they permit the miniaturization of the devices in which they are used, 0
• a quantity of lOOg Fe-nBisSig alloy is prepared by induction melting in vacuum pure components in the shape of powders bond together by pressing and heating in vacuum About lOg of the as prepared alloy are introduced in a Pyrex tube, closed at the
• the upper end of the tube is connected at a vacuum device which provide a vacuum of 10 4 N/m 2 and allow to introduce an inert gas at a pressure level of 100 N/m 2
• the bottom end of the tube which contains the alloy is placed into an induction coil in the shape of a single spiral of a certain profile which is feed by a medium frequency
• a glass- covered wire was produced in the same manner as in Example 1 , using an alloy of composition Co 4 oFe 4 oB ⁇ 2 Si « which was prepared in vacuum from bulk pure components
• the glass tube has 10 mm external diameter, 1 mm thickness of the glass wall and 50 cm in length.
• wires are used for magnetic sensors, transducers, and actuators measuring mechanical quantities
• a glass- covered wire was produced in the same manner as in Example 1 , using 20 an alloy of composition C075B15S110
• the glass tube has 10 mm external diameter
• a glass- covered wire was produced in the same manner as in Example 1 , using an alloy of composition Co oFe5BuSi ⁇ o
• the glass tube has 1 1 mm external diameter, 0 8 mm thickness of the glass wall and 45 cm in length In the glass tube they are introduced and melted 12g of the mentioned alloy, the melt temperature being 1200 + 50°C
• the process parameters are maintained at constant values of 50 x IO '6 m/s feed-in speed of the glass tube, 2 m/s peripheral speed of the winding drum, and 17 x 10 "6 m7s flow capacity of the cooling liquid
• the resulted amo ⁇ hous magnetic glass-covered wire of composition Co 7 oFe5B ⁇ sSi ⁇ o having nearly zero magnetostriction, 16 ⁇ m diameter of the metallic core and 5 ⁇ m thickness of the glass cover present the following magnetic characteristics
• wires are used for magnetic field sensors, transducers, magnetic shields and devices operating on the basis of the giant magneto-impedance effect
• a glass- covered wire was produced in the same manner as in Example 1 , using an alloy of composition Fe 7 3 5Cu ⁇ Nb ⁇ B ⁇ Sii35 prepared in argon atmosphere from pure components in the shape of powders bond by pressing and heating in vacuum
• the glass tube has 10 mm external diameter, 0 6 mm thickness of the glass wall and 50 cm in length In the glass tube they are introduced and melted lOg of the mentioned alloy, the melt temperature being 1200 + 50°C
• the process parameters are maintained at constant values of 6 5 IO "6 m/s feed-in speed of the glass tube, 0 8 m/s peripheral speed of the winding drum, and 18 x IO "6 m 3 /s flow capacity of the cooling liquid
• the resulted positive magnetostrictive amo ⁇ hous magnetic glass-covered wire of composition Fe 7 35Cu ⁇ Nb3B 9 Sii3 5 having 22 ⁇ m diameter of the metallic core and 4 ⁇ m thickness of the glass cover present the following magnetic characteristics
• a special thermal treatment is applied to an amo ⁇ hous magnetic wire of composition Fe ⁇ sCuiNbsBoSin s obtained in the same manner as in Example 5
• the special character of the thermal treatment refers to the strict correlation between the temperature and the duration of the thermal treatment
• the magnetic amorphous glass- covered wire having the above mentioned composition is introduced into an electric furnace, in argon atmosphere and is thermally treated at 550°C for 1 hour In this way one obtains a magnetic glass-covered wire having nanocrystalline structure that present the following magnetic characteristics-

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Dispersion Chemistry (AREA)
• Power Engineering (AREA)
• Crystallography & Structural Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Soft Magnetic Materials (AREA)
• Powder Metallurgy (AREA)

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• 1995
  • 1995-12-27 RO RO95-02277A patent/RO111513B1/ro unknown
• 1996
  • 1996-11-12 EP EP96940189A patent/EP0870308B1/en not_active Expired - Lifetime
  • 1996-11-12 DE DE69634180T patent/DE69634180T2/de not_active Expired - Lifetime
  • 1996-11-12 WO PCT/RO1996/000009 patent/WO1997024734A1/en active IP Right Grant
  • 1996-11-12 CA CA002241220A patent/CA2241220C/en not_active Expired - Lifetime
  • 1996-11-12 SK SK825-98A patent/SK285131B6/sk not_active IP Right Cessation
  • 1996-11-12 US US09/101,006 patent/US6270591B2/en not_active Expired - Lifetime
  • 1996-11-12 EP EP02019256A patent/EP1288972B1/en not_active Expired - Lifetime
  • 1996-11-12 ES ES02019256T patent/ES2233753T3/es not_active Expired - Lifetime
  • 1996-11-12 ES ES96940189T patent/ES2238699T3/es not_active Expired - Lifetime
  • 1996-11-12 CZ CZ0185998A patent/CZ297367B6/cs not_active IP Right Cessation
  • 1996-11-12 DE DE69634518T patent/DE69634518T2/de not_active Expired - Lifetime

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